This is a really really simple frittata recipe from Good Housekeeping that takes minimal prep time and is a super fast healthy main dish. I'm posting it here so I don't lose it, but I'm sure that everyone else will enjoy it as well!
Preheat broiler. In large bowl, with fork, mix spinach, eggs, egg whites, green onions, feta, 1/2 cup mozzarella, and 1/4 teaspoon salt until well blended.
In broiler-safe nonstick 10-inch skillet, heat oil over medium heat . Pour egg mixture into skillet; arrange tomatoes on top, pushing some down. Cover skillet and cook frittata 5 to 6 minutes or until egg mixture is just set around edge.
Place skillet in broiler 5 to 6 inches from source of heat and broil frittata 4 to 5 minutes or until just set in center. Sprinkle with remaining 1/4 cup mozzarella; broil about 1 minute longer or until cheese melts.
To serve, loosen frittata from skillet. Leave frittata in skillet or slide onto warm platter; cut into wedges.